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3D numerical analysis of time-dependent behavior of a tunnel constructed with conventional support system

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/66174

Title: 3D numerical analysis of time-dependent behavior of a tunnel constructed with conventional support system
Authors: Arima, H. Browse this author
Sainoki, A. Browse this author
Fukuda, Daisuke Browse this author →KAKEN DB
Kodama, Jun-ichi Browse this author →KAKEN DB
Fujii, Yoshiaki Browse this author →KAKEN DB
Keywords: Mountain tunnel
Conventional support system
Weak rock formation
Time-dependent behavior
Viscoelastic analysis
Issue Date: 10-May-2017
Publisher: International Society for Rock Mechanics
Journal Title: Proceedings of 2017 ISRM Young Scholars’ Symposium on Rock Mechanics (YSRM 2017) & 2017 International Conference on New Development in Rock Mechanics and Geotechnical Engineering (NDRMGE 2017)
Volume: 2017
Start Page: 250
End Page: 253
Abstract: In Hokkaido prefecture, Japan, a number of road mountain tunnels constructed with conventional support systems are still in use. In one of the tunnels, the progressive damage evolution and large deformation of the tunnel wall were observed. The present study investigates its mechanism and the effectiveness of the conventional support system. In order to simulate the time-dependent behavior of the target tunnel, a variable-compliance-type constitutive equation is employed and implemented into FLAC3D. A 3D numerical model reproducing the actual ground surface topography is constructed. Using the numerical model and constitutive equation, the time-dependent damage evolution and resultant deformational behavior are simulated whilst considering combinations of the conventional support system members, namely steel sets, concrete lining and invert concrete. The analysis results show that concrete invert installation is the most effective measure to suppress and control the damage evolution and deformation of the tunnel wall. The concrete lining is the second effective, alleviating the deformation taking place on the tunnel wall and crown. It is then revealed that steel sets do not significantly contribute to suppressing the damage evolution. The analysis result also indicates that axial stresses originally acting on the steel sets are re-distributed to the concrete lining and invert concrete, proving that the two support members can work more effectively than steel sets in the aspect of controlling the time-dependent damage evolution of the surrounding rock mass.
Description: 2017 ISRM Young Scholars’ Symposium on Rock Mechanics (YSRM 2017) & 2017 International Conference on New Development in Rock Mechanics and Geotechnical Engineering (NDRMGE 2017).10-13 May, 2017,Jeju,Korea
Conference Name: 2017 ISRM Young Scholars’ Symposium on Rock Mechanics (YSRM 2017) & 2017 International Conference on New Development in Rock Mechanics and Geotechnical Engineering (NDRMGE 2017)
Conference Place: Jeju
Type: proceedings
URI: http://hdl.handle.net/2115/66174
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤井 義明

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